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  Home > JCE Print > Journal of Chemical Education > Issues > 1997  > May  >
In the Laboratory
Effect of Dielectric Constant and Ionic Strength Variation on the Fading of N,N-Dimethylaminophenolphthalein in Alkaline Medium
M. Dakkouri and W. Bodenmuller
Abteilung fur Elektrochemie, Universitat Ulm, PO BOX 4066, D-89069 Ulm, Germany
Cover
May 1997
Vol. 74 No. 5
p. 556
Abstract
Based on the Bronsted-Christiansen-Scatchard equation the influence of the ionic strength I and the permittivity e (dielectric constant) on the rate of ionic reactions has been studied. Experiments carried out by students have shown that the application of N,N-dimethylaminophenolphtalein (DMAPP) instead of the usually used phenolphthalein provides more pertinent results visualizing the role of the salt effect by the consideration of the rate of ionic reaction. A modified route for the preparation of DMAPP as well as the procedure for the performance of the fading experiment have been described. Furthermore, the results obtained from students’ experiments demonstrating the influence of I and e of the solvent on the rate constant k have been presented and discussed.
More Information
*  Citation
 Dakkouri, M.; Bodenmuller, W. . J. Chem. Educ. 1997 74 556.
*  Keywords
 Physical Chemistry, Electrochemistry, Kinetics, Solutions/Solvents
*  History
 Created:
Last Updated:		 July 28, 1999
June 23, 2005
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